Grate for steam-generator furnaces.



R. A. TARR. GBATB FOB STEAM GENERATOR rmmwns.

Patented m a, 1909.

APPLIOATIOH FILED DBO. 31, 1807.

R. A. TARR. GRATE FOR STEAK GENERATOR FURNACES.

' APPLIQATIOI FILED DEC. 31, 1007. Patented 6,

SBIEETl-BKBST 2 R. A. TARR. GBATB ron s'rmm GENERATOR FURNACES.

APPLICATION rum) 0110.31, 1907. Patented July 6' 1909.

loo-u Inns, u-c. Luna" man-mun. u. c

UNITED STATES. racism onn on.

ROBERT ARNOLDTARR, or BEnMINsrER, ENGLAND, ASSIGNOR To, LES IE DUNN, or

BRISTOL, ENGLAND.

Specification of Letters Patent.

Patented July 6, 1909.

Application filed December. 31, 1901. semi No. 408,819

To all whom it may concern:

Be it known that I-, ROBERT ARNoLD TARR,

a] subject of the King of Great Britain and.

.Ire]and,,residing at Melville Terrace, Bed

minster, England, have invented an Improved (hate for Steam-Generator Fur' paces, of which the following is a specificaion. Y

The special feature of'the invention is that thegrate is composed of rocking'bars or sec tlons whichturn the fuel over several times durmgit-s passage through the furnace. The fuel is t us broken up and a light open fire .is produced, "whereby practically peg feet combustion, is obtained. The shorter" thus accomplishes all that can be effected by the best hand stoking by the constant use of the slicing bar. i I

The details'of construction, arrangement, and operation of parts are as hereinafter described, and illustrated in the accompanying drawing, in which Figure 1 1s a vertical longitudinal section of .a" furnace grate constructed according to my invention. Fig. 2 is a perspective view of one of the rocking grate sections, or firebars. Fig. 3 is a plan view of a fire-bar, or

{grate section. Fig. 4 is a rear elevationnof the same. Fig. 5 is ,a plan of a portion of the endless chain employed for rocking or tilting the fire-bars, or grate sections. Fig. 5 is a front elevation of a boiler fitted with this apparatus.

The a paratus comprises fixed bars and rocking bars, the latter being arranged between the former and approximately sectorshape in'transverse section. The movable fire-bars are journaled eccentrically at each end in a frame and adapted to rock or tilt in a vertical plane, when actuated by means adapted for the purpose, which in this case consist of endless. chains (1. The vertical pendent portions of the fire-bars a are rovided with open slots, or notches, at as shown in Fig. 2, to receive one or more such chains d, which run on pulleys a, f, and are driven by gearin actuated by any suitable inotor. The pulleys e are arranged at the ds of the grate. The chainsd travel con- ElllOllSlY and are each provided with, later y projectin pins 0. Thus, as-the chains ve thron the fire-bars, or grate sections a, the lat are rocked, or thrown upward, 'succes sively, as shown by dotted ines in Fig. 1.

the notches or open slots b When thus tilted, they discharge their load offuel from one fire-bar or grate sectionon to the one in rear of it, and in this way the fuel is advanced from the front of the furnace to the rear end of the'sam e. When the tilting pins 0 have passed through the slots b in one'fire-bar, or grate section, the "latter being weightedv on oneside returns to its normal position bygravity', and the next bar in succession is then similarly operated. The return of the fire-bars to normal position by gravity is due to-the factthat they are pivoted eccentrically, being thusweighted on one -"side, as showm Their top portions are'fiat, and alsorhorizontalwhen the fire-bars are in their normal position. The continuous travel of-the upper runs of the chains :Lthus rocks allthe 'fii'e-bars'succes sively, from rear to front, and each fire-bar in turn dischar es fromfront to rear the in candescent fuel resting thereon. Such sue:-

' cessive tilting of the fife-bars will obviously go on so long as the chains are caused to travel; 7 y y Beneath the upperlap or 'run of each of the 30 chainsd, and between tlie slots 1), a bar of; angle iron orthel'ike is arranged lengthwise of the combustigrf chamber and supported by cross bars -i, an serve to limit the sagging of the chains.

' A fuel feeder g 1s arranged beneath the hopper and is worked by'mechanism Z in the usualmanner. v 7

I provide a steam distributor which is located at the rear of the fire-grate and consists of a cast-iron. box m having a perforated face n through the perforations or apertures '0 of which'the steam passing from the pipe p is discharged intothe accumulated cokewhich is heated between the said distributor 95 and the front of the bridge.

g is a feed pipe'for pipe p. A pipe r (ljig. ll is preferably provided within the steam pipe for supplyingvolatile hydrocarbon to the coke. -What'I claim is:

1, In a furnace, the combination with a frame and a series ofrocking fire-bars ai -I ranged' side by side transversely of said frame, and 'journaled eecentrically so the are weighted on one side,.of an endless travcling chain arranged beneath said bars andhaving )ortions'which, while the uppeiyrun of the chain travels from rear to front of the grate, come in. contact-with, and then releases, the lower portion of said fire-bars, whereby they are successively rocked from rear to front of the furnace, and then restored to the normal position by grayity, as

described.

2. In a furnace, the combination with a supportlng frame and a series of fire-bars arranged transversely to the direction of travel of the fuel and jonrnaled eccentrically and having pendent portions provided with 7 slots, of endless. traveling chains arranged below and. parallel to the grate whose upper run travels from rear to front of'the grate and is arranged in the said slots and pro-- vided with'projections adapted for contact 15 with ortions adjacent to the slots, whereby the re bars are successively rocked from rear to front of the furnace, and the fuel rest- ROBERT ARNOLD man.

Witnesses:

JOHN LEE OSBORN. Rron. Cas'rnn. 

